wicket: Dropdownchoice

i have two dropdowns using same model and sets the value into it. Dropdown1 will visible on screen always and Dropdown2, will be visible for only one particular option choosen in Dropdown1. and i am making an query to the DB based on the selections in dropdowns.

But when i have both the dropdown first and then hide the second one, The value already set but the Dropdown2 is still avalible in my model, and making my query to fetch improper data.

So can any one suggest me an idea, how to set the value to null for the attribute which is actually set but dropdown2, if dropdown2 is inVisible.

(i tried to set the ModelObject to null, when making the dropdown2 invisible (using AjaxFormComponentupdateBehavior), but when i make the dropdown2, visible again, it returns null,even if开发者_如何转开发 i make any selection in it)

Are you using a LoadableDetachableModel ? try to explicitly detach model from that dropdown on setHide event. I did not try it though.